BARABOO, Wis. -- The lawyers for convicted killer Terry Vollbrecht focused on DNA evidence Thursday in their attempt to get Vollbrecht a new trial.

The DNA evidence was part of day four of an evidentiary hearing to see if Vollbrecht deserves a new trial for the 1987 murder of Angela Hackl in 1987 in Sauk County.

Vollbrecht's lawyers from the Wisconsin Innocence Project continued to push their theory that someone else killed Hackl.

In 1987, the 18-year-old Hackl was found shot three times and hanging from a tree by a chain.

Prosecutors eventually charged and convicted the man she'd been seen with at a bar that night -- Vollbrecht.

But 20 years later, Vollbrecht and his lawyers are trying to point the finger at other possible killers.

On Thursday, a state crime lab DNA analyst talked about DNA tests done on three items taken from the murder scene: a vaginal swab of the victim, a blood stain and a semen stain from a sleeping bag.

During questioning the analyst said DNA on the sleeping bag did not match Vollbrecht.

"Is it accurate then that Terry Vollbrecht cannot be excluded from DNA in the victim's vaginal swabs?" asked Vollbrecht's attorney Michael Findley, of Wisconsin Innocence Project.

The analyst replied, "Correct."

Findley asked, "But he is excluded from semen stains on sleeping bag?"

"Yes," the analyst replied.

Findley asked, "And from the blood stains on sleeping bag?"

"Yes," the analyst replied.

But under cross examination, the DNA analyst also said that Kim Brown, the man convicted of killing a different Sauk County woman, could not be connected to any of the DNA on the items tested.

Vollbrecht's lawyers put another convicted killer on the stand Wednesday to say that Brown confessed to him in 1993 that he killed Hackl.

DNA analyst Linnea Schiffner testified Thursday that a third person's DNA was present in the sample from Hackl but no gender could be determined.

She also said a Sauk City officer -- along with Brown -- could not be connected to DNA tested from the sleeping bag.